CN105162535A - Isolation test device and method - Google Patents
Isolation test device and method Download PDFInfo
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- CN105162535A CN105162535A CN201510489903.5A CN201510489903A CN105162535A CN 105162535 A CN105162535 A CN 105162535A CN 201510489903 A CN201510489903 A CN 201510489903A CN 105162535 A CN105162535 A CN 105162535A
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Abstract
The invention discloses an isolation test device and method. The device comprises a filter, a switch control module connected to a plurality of ports of the filter, a network analyzer and a terminal connected to the switch control module. The terminal is connected with the network analyzer. The terminal is used for sending a switch switching signal of to-be-tested port isolation to the switch control module. The switch control module is used for switching a switch according to the switch switching signal sent by the terminal. The terminal is also used for sending a test signal of to-be-tested port isolation to the switch control module through the network analyzer. The switch control module is also used for obtaining an isolation signal of to-be-tested port isolation according to the test signal, and sending the isolation signal to the terminal through the network analyzer. The test device improves the test efficiency of filter port isolation, prevents misdetection, cable loose connection and cable misconnection in a signal jittering condition caused by cable plugging in the batch test, and prevents outflow of adverse equipment caused by missed testing of to-be-tested ports.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of isolation degree test device and method of testing.
Background technology
Along with Mobile Communication Development, the work of multi-frequency multichannel is more and more general, need in limited spectral range, to mark off more frequency range to different operators, higher to configuring performance of filter requirement in all systems, the kind of cavity body filter also gets more and more, interchannel horizontal isolation is also more and more important, because the crosstalk of isolation more between high channel is less.Isolation is more and more as one of test index in multi-channel rf equipment.
The isolation degree test scheme of current filter industry, as shown in Figure 1, the prevention at radio-frequency port of filter, as BMA: first arrange net point bandwidth before test, calibration cable, generates a calibration file; Then the port one that net divides is met filter BMA0, port 2 meets BMA1, is divided call calibration file by computer network interface Controling network, scanning, and reads S12, and S21 parameter maximum, its value is the isolation between BMA0 and BMA1.After testing the isolation of BMA0-BMA1, a net point port one is met BMA1, and port 2 meets BMA2, the isolation between test b MA1-BMA2 port.The same isolation tested successively between remaining passage, until the isolation testing between BMA (N-1)-BMA (N).
Above-mentioned in the isolation degree test process of multi-channel rf equipment, need the tested port switch test passage manually changing cable connection, exist in batch testing under cable plugs the signal jitter situation caused and survey by mistake, cable does not connect tightly, wrong, tested port test leakage causes bad equipment to outflow; Repetition measurement efficiency is low; Testing time cannot management and control, causes cannot preparing to obtain production production capacity, calling of equipment; The problems such as poor compatibility.
Summary of the invention
For defect of the prior art, the invention provides a kind of isolation degree test device and method of testing, when manually not changing the tested port switch test passage that cable connects, achieving the test to multiport isolation, improve the testing efficiency of port of wave filter isolation.
First aspect, the invention provides a kind of isolation degree test device, comprising:
Be provided with the filter of multiple port, the switch control module be connected with multiple ports of described filter, the network analyzer that is connected with described switch control module be connected with described network analyzer with terminal, described terminal;
Described terminal, for sending the switching over signal of interport isolation to be measured to described switch control module;
Described switch control module, switches the switch in this switch control module for the switching over signal sent according to described terminal, communicates with port to be measured to make described switch control module;
Described terminal, also for being sent the test signal of interport isolation to be measured to described switch control module by described network analyzer;
Described switch control module, for obtaining the isolation signal of described port to be measured according to described test signal, and is sent to described terminal by described isolation signal by described network analyzer.
Optionally, described device also comprises: switch;
The first end of described switch is connected with described terminal, and the second end is connected with described network analyzer, for transmitting test signal between described terminal and described network analyzer and isolation signal;
3rd end of described switch is connected with described switch control module, sends described switch control module for the switching over signal described terminal sent.
Optionally, described switch control module comprises first group of switch and second group of switch;
The type of described switch is arranged according to the quantity of the isolation port to be measured in described filter, when the quantity of described isolation port to be measured is N, described first group of switch is 1 cut (N-1)/2, described second group of switch is 1 cut (N-1)/2+1 two groups of switches, wherein, N be more than or equal to 1 positive integer.
Optionally, described 1 cut (N-1)/2 of cutting (N-1)/2+1 two groups of switches with 1 in (N-1)/2 and be connected by holding wire with N number of port in described filter respectively with (N-1)/2+1 switching over interface.
Optionally, described network analyzer comprises two interfaces, and two interfaces of described network analyzer are connected with two groups of switches of described switch control module respectively.
Second aspect, present invention also offers the method for testing according to above-mentioned isolation degree test device, comprising:
Terminal sends the switching over signal of interport isolation to be measured to switch control module;
Switch in this switch control module switches by the switching over signal that described switch control module sends according to described terminal, communicates with port to be measured to make described switch control module;
Described terminal sends the test signal of interport isolation to be measured to described switch control module by described network analyzer;
Described switch control module obtains the isolation signal of described port to be measured according to described test signal, and described isolation signal is sent to described terminal by described network analyzer.
Optionally, described method also comprises:
Described terminal, when receiving the isolation of port to be measured, judges described isolation whether in the scope of default isolation, and under the isolation of test result and corresponding port is stored in the sequence number catalogue of filter corresponding to this port.
Optionally, described method also comprises:
To send the switching over signal of interport isolation to be measured to switch control module in described terminal before, obtain the sequence number of filter, judge whether the port of the filter that described sequence number is corresponding carried out isolation degree test according to described sequence number catalogue;
Without test result under described sequence number catalogue, or have not by test test result time, the step of the isolation of described execution test port.
Optionally, described method also comprises:
Without test result under described sequence number catalogue, or have not by test test result time, obtain preset calibration file;
Calibrate according to the port path of default calibration file to the filter of isolation to be tested;
Accordingly, the generation method of described default calibration file comprises:
Every bar port path of the filter of isolation to be tested is numbered, and mates corresponding switching over pattern to every bar port path;
Successively every bar port path is calibrated, generate and preserve this calibration file.
Optionally, described method also comprises:
When the isolation of the port of test filter, test according to the default frequency corresponding with described filter bandwidht.
As shown from the above technical solution, a kind of isolation degree test device provided by the invention and method of testing, this device by arranging switch control module between network analyzer and described filter, wherein in switch control module, switch is set, by switching switch, realize the switching of multiple port, thus achieve when manually not changing the tested port switch test passage that cable connects, to the test of multiport isolation, this testing apparatus improves the testing efficiency of port of wave filter isolation, do not exist in batch testing under cable plugs the signal jitter situation caused simultaneously and survey by mistake, cable does not connect tightly, wrong, tested port test leakage causes bad equipment to outflow.
In specification of the present invention, describe a large amount of detail.But can understand, embodiments of the invention can be put into practice when not having these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Those skilled in the art can understand, although embodiments more described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present invention and to form different embodiments.Such as, in the following claims, the one of any of embodiment required for protection can use with arbitrary compound mode.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme, it all should be encompassed in the middle of the scope of claim of the present invention and specification.
Accompanying drawing explanation
Fig. 1 is the structural representation of isolation degree test of the prior art;
The structural representation of a kind of isolation degree test device that Fig. 2 provides for one embodiment of the invention;
The schematic flow sheet of a kind of isolation degree test method that Fig. 3 provides for one embodiment of the invention;
The schematic flow sheet of a kind of isolation degree test method that Fig. 4 provides for another embodiment of the present invention;
The schematic flow sheet being carried out testing apparatus calibration by calibration file that Fig. 5 provides for one embodiment of the invention;
The structural representation of the compatible S parameter test that Fig. 6 provides for one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Fig. 1 is the structural representation of isolation degree test device in prior art, due to when testing the isolation of multiport, survey a passage and change a passage, testing time cannot management and control, because the speed of service of instrument is very fast, two channel isolations are tested being less than in 10S and can completing test, so the management and control of the operating time of workman will be whole test bottleneck, according to the qualification of tester, working attitude etc. are different and have very large difference.Complicated operation, efficiency is low, if because isolation is separately as an operation, Environmental costs and management and control cost can increase, if other parameter testing compatible of every passage, needs to change adapter.
Exist in batch testing under cable plugs the signal jitter situation caused and survey by mistake, cable does not connect tightly, wrong, and tested port test leakage causes bad equipment to outflow.
The signal very wide for multifrequency point bandwidth adopts primary calibration, and test result may not be too accurate or the testing time is long.Because bandwidth is too wide, low and middle-end instrument number of scan points may not, cause calibration not to be too accurate.But high-end instrument number of scan points is enough, but along with number of scan points increase, when one section simultaneously between frequency and frequency very wide without dedicated bandwidth, the test scan time will increase very long.
For above-mentioned technical problem, the invention provides a kind of testing apparatus and method of testing of isolation, solve the problems referred to above.
Fig. 2 shows the structural representation of a kind of isolation degree test device that one embodiment of the invention provides, and as shown in Figure 2, this testing apparatus comprises:
Be provided with the filter 21 of multiple port, the switch control module 22 be connected with multiple ports of described filter, the network analyzer 23 that is connected with described switch control module 22 be connected with described network analyzer 23 with terminal 24, described terminal 24;
Described terminal 24, for sending the switching over signal of interport isolation to be measured to described switch control module;
This terminal can be computer, mobile phone or other testing equipments.
Described switch control module 22, switches the switch in this switch control module for the switching over signal sent according to described terminal, communicates with port to be measured to make described switch control module;
Switch in above-mentioned switch control module can use program-controlled radio-frequency (RF) switch.
Described terminal 24, also for being sent the test signal of interport isolation to be measured to described switch control module by described network analyzer;
Described switch control module 22, for obtaining the isolation signal of described port to be measured according to described test signal, and is sent to described terminal by described isolation signal by described network analyzer.
This device by arranging switch control module between network analyzer and described filter, wherein in switch control module, switch is set, by switching switch, realize the switching of multiple port, thus achieve when manually not changing the tested port switch test passage that cable connects, to the test of multiport isolation, this testing apparatus improves the testing efficiency of port of wave filter isolation, do not exist in batch testing under cable plugs the signal jitter situation caused simultaneously and survey by mistake, cable does not connect tightly, wrong, tested port test leakage causes bad equipment to outflow.
In order to the terminal in described device be connected with network analyzer and switch control module, said apparatus also comprises: switch 25;
The first end of described switch is connected with described terminal, and the second end is connected with described network analyzer, for transmitting test signal between described terminal and described network analyzer and isolation signal;
3rd end of described switch is connected with described switch control module, sends described switch control module for the switching over signal described terminal sent.
It is first group of switch and second group of switch respectively that described switch control module comprises two groups of switches, and described network analyzer comprises two interfaces, and two interfaces of described network analyzer are connected with two groups of switches of described switch control module respectively.
The type of described switch is arranged according to the quantity of the isolation port to be measured in described filter, when the quantity of described isolation port to be measured is N, described first group of switch is 1 cut (N-1)/2, described second group of switch is 1 cut (N-1)/2+1 two groups of switches, wherein, N be more than or equal to 1 positive integer.Described 1 cuts (N-1)/2 of cutting (N-1)/2+1 two groups of switches with 1 in (N-1)/2 is connected by holding wire with N number of port in described filter respectively with (N-1)/2+1 switching over interface.
Said apparatus achieves the test of filter isolation one keyization, without the need to artificial participation in test process, and easier management and control.Calibration mode after the introducing of variable connector utilizes calibration file as the storage intermediary of data, and before making calibration realization is equal to, the test pattern of single channel, realizes the poor operation of batch, make test more efficient.
Use program-controlled radio-frequency (RF) switch to carry out, in the test switched, utilizing signal to flow to symmetry, if test the isolation of N number of port, only need 1 to cut (N-1)/2,1 cuts (N-1)/2+1 two groups of switches; Cut N-1 for 2 group 1 than turning test needs automatically by current manual test scheme, N-2 group 1 is cut 2 switches and is more saved equipment cost, and simultaneously because introducing less switch isolation degree error, it is more accurate to test.
The schematic flow sheet of the method for testing of a kind of isolation degree test device that Fig. 3 provides for the embodiment of the present invention, as shown in Figure 3, the method comprises the steps:
301, terminal sends the switching over signal of interport isolation to be measured to switch control module;
Switch in this switch control module switches by the switching over signal that 302, described switch control module sends according to described terminal, communicates with port to be measured to make described switch control module;
303, described terminal sends the test signal of interport isolation to be measured to described switch control module by described network analyzer;
304, described switch control module obtains the isolation signal of described port to be measured according to described test signal, and described isolation signal is sent to described terminal by described network analyzer.
Switch in switch control module is switched by switching over signal by the method, communicate with port to be measured to make described switch control module, and then the isolation signal of described port to be measured is obtained according to described test signal, the method is by switching switch, realize the switching of multiple port, thus achieve when manually not changing the tested port switch test passage that cable connects, to the test of multiport isolation.
After testing isolation, said method also comprises unshowned step 305 in Fig. 3:
305, described terminal is when receiving the isolation of port to be measured, judges described isolation whether in the scope of default isolation, and under the isolation of test result and corresponding port is stored in the sequence number catalogue of filter corresponding to this port.
Fig. 4 shows the schematic flow sheet of the method for testing of a kind of isolation degree test device that the embodiment of the present invention provides, and as shown in Figure 4, the method comprises the steps:
401, terminal obtains the sequence number of filter to be measured;
Concrete, before above-mentioned 401 steps, the method also comprises: connect filter cable;
402, the filter that this sequence number of terminal judges is corresponding is the need of carrying out isolation degree test.
Will be understood that, to send the switching over signal of interport isolation to be measured to switch control module in described terminal before, obtain the sequence number of filter, judge whether the port of the filter that described sequence number is corresponding carried out isolation degree test according to described sequence number catalogue;
Without test result under described sequence number catalogue, or have not by test test result time, the step of the isolation of described execution test port.
403, when needs are tested, terminal obtains the default calibration file of i passage to be tested;
Will be understood that, when not needing to test, then stop test, namely think that the isolation of this filter is completed, and test result is within the scope of default isolation.
Concrete, without test result under described sequence number catalogue, or when having not by the test result of testing, calibrate according to the port path of default calibration file to the filter of isolation to be tested;
Accordingly, the generation method of described default calibration file comprises:
Every bar port path of the filter of isolation to be tested is numbered, and mates corresponding switching over pattern to every bar port path;
Successively every bar port path is calibrated, generate and preserve this calibration file.
404, terminal obtains the testing standard of the default frequency corresponding with described filter bandwidht.
When the isolation of the port of test filter, test according to the default frequency corresponding with described filter bandwidht.
Switch in this switch control module switches by the switching over signal that 405, switch control module sends according to described terminal.
406, switch control module sends the isolation signal of the described port to be measured of test signal acquisition of interport isolation to be measured by described network analyzer according to terminal;
407, terminal obtains the isolation of port to be measured;
408, whether terminal judges isolation is within the scope of default isolation.
If terminal judges isolation is not when default isolation scope, then terminate test.Do not perform following step.
409, judge whether N number of passage is completed.Wherein N is port number to be tested.If be not completed, the passage i of port added 1 (i is less than or equal to the positive integer that N is greater than 1), and turn back to above-mentioned steps 403.
If 410 N number of lane testings are complete, terminal generates test report under the isolation of test result and corresponding port is stored in the sequence number catalogue of filter corresponding to this port.
Concrete, said method is before each test, and instrument needs the calibration with standard component, instrumentation tap and the cable that connects being carried out to loop back mode.After switch control module introduces gate-controlled switch group, the cable at instrumentation tap place becomes complex, perform separately after calibration Ru Mei road switches and need the calibration once completing 8*8 paths, efficiency was time and effort consuming than former way, above-mentioned steps 403 is by the method for calibration file, as shown in Figure 5, be numbered by every bar path, and mate corresponding switch-linear hybrid pattern, switched by order control, automatic calibration is carried out after connection, and the data after calibration are all write in calibration file, when producing pipelining operation in batches, when cable can not be dismantled from instrument, and all connections of switch module are all permanent plants, manually need not contact, so just do not calibrate again in the every platform test of needs, only need calibration file be imported in instrument, the data of each passage of direct configuration, because calibrating long problem consuming time when avoiding production.
Insertion switch control module in said method, switching channel, the configuration of calibration file and terminal control, achieve docking with the integration of instrument of multichannel equipment, the process of test filter isolation need not artificially be participated in.Calibration mode after the introducing of variable connector utilizes calibration file as the storage intermediary of data, the test pattern of single channel before making calibration realization is equal to.
Because the bandwidth of part filter calibration to be tested is very wide, such as multifrequency point filter, high-end instrument number of scan points is generally many, but price is high, and during test, sweep time increases simultaneously.And the number of scan points of middle-end and low side instrument is generally very limited, thus the number of scan points that narrow allocated bandwidth is arrived is little.Such as test the signal of 10M, calibration bandwidth expands to 6G, and scanning element is set to 1001 points, and so the signal of 10M is only assigned with (10/6000) * 1001 ≈ 2 points, is straight line.After sampling number is few, the effect of signals for transition band is very large, because the signal slope of this part is large.Simultaneously large on the impact of inband signaling, because obtaining signal after filter filtering is have many different frequent points signal combination to form, inband signaling is not flat, is have certain fluctuation, if sampling number is few, this partial data is also forbidden yet.This programme adopts sectional calibration, calls corresponding section and carry out testing during test.
First time test needs, on program interface, whole for filter test bandwidth is carried out segmentation by design objective, specify beginning frequency and the cut-off frequency of each section, and to the number of scan points of each section, IF bandwidth, power level, scan mode, is arranged, then preserve this setting, next time can directly call.Then, to the setting that instrument is correlated with, after cable and external electrical calibrating device connect, terminal sends order to instrument and carries out fractional scanning, and after scanning, instrument generates multistage calibration data.During test, terminal selects corresponding segmentation according to the scope at test frequency place, and the calibration data then calling this section is tested.The all frequency range primary calibrations of comparison, result is more accurate; Can skip during test simultaneously between frequency without dedicated bandwidth, decrease test between time frequency point and frequency without dedicated bandwidth sweep time, make test more efficient.
The structural representation of the compatible S parameter test that Fig. 6 provides for the embodiment of the present invention, as shown in Figure 6, is equally also applicable to the test of compatible S parameter at said apparatus and method.But switch control module adds two switches on the basis of said apparatus.Normal signal flows to the flow direction as signal 1, and horizontal isolation is isolation between two neighboring traces, and signal flows to as shown in signal 2.The isolation of test filter prevention at radio-frequency port, as BMA end, utilizes isolation S12, the signal of S21 flows to symmetry, and BMA0 meets the port1 of network analyzer, and BMA1 meets network analyzer port2 and records the port2 that isolation and BMA0 connect network analyzer, BMA1 meets network analyzer port1, and to record isolation be equivalent, and utilize this characteristic, the flow direction making each port signal of equipment is staggered, BMA0, BMA2, BMA4, BMA6, BMA8 signal exports, BMA1, BMA3, BMA5, BMA7 signal inputs.Such as isolation between test b MA0_BMA1, cuts pass and makes BMA0 meet port1, cuts pass and makes BMA1 meet port2, between test b MA1-BMA2 during isolation, only need the switch cutting BMA2, make BMA2 meet port1, only need the switch of a switching port herein.Isolation degree test below also in like manner, only needs switching port switch at every turn.Improve efficiency, have good autgmentability simultaneously, if need test as signal 1 flows to signal, only need change channel B MA1, BMA3, BMA5, BMA7 into output by input, meet net point port2; The port of the other one end of filter, all as input, meets net point port1.If by the method for original manual test filter, other index of filter and isolation are integrated test, filter BMA holds needs 81 to cut 2 switches, and the increase of switch have also been introduced more isolation error and cost simultaneously.Said method is equally also applicable in the test of compatible S parameter, and the present embodiment is not described in detail.
Said apparatus and method, on the basis of original filter isolation degree test, improve isolation degree test environment, introduce program-controlled radio-frequency (RF) switch, calibration file is integrated, utilizes signal to flow to symmetry, thus use minimum switches set, realize the switching of signal, realize a keyization test; Also utilize sectional calibration to make multifrequency point, the test of the signal of wide bandwidth is more accurate, more simultaneously.
Claims (10)
1. an isolation degree test device, is characterized in that, comprising:
Be provided with the filter of multiple port, the switch control module be connected with multiple ports of described filter, the network analyzer that is connected with described switch control module be connected with described network analyzer with terminal, described terminal;
Described terminal, for sending the switching over signal of interport isolation to be measured to described switch control module;
Described switch control module, switches the switch in this switch control module for the switching over signal sent according to described terminal, communicates with port to be measured to make described switch control module;
Described terminal, also for being sent the test signal of interport isolation to be measured to described switch control module by described network analyzer;
Described switch control module, also for obtaining the isolation signal of described port to be measured according to described test signal, and is sent to described terminal by described isolation signal by described network analyzer.
2. device according to claim 1, is characterized in that, described device also comprises: switch;
The first end of described switch is connected with described terminal, and the second end is connected with described network analyzer, for transmitting test signal between described terminal and described network analyzer and isolation signal;
3rd end of described switch is connected with described switch control module, sends described switch control module for the switching over signal described terminal sent.
3. device according to claim 1, is characterized in that, described switch control module comprises first group of switch and second group of switch;
The type of described switch is arranged according to the quantity of the isolation port to be measured in described filter, when the quantity of described isolation port to be measured is N, described first group of switch is 1 cut (N-1)/2, described second group of switch is 1 cut (N-1)/2+1 two groups of switches, wherein, N be more than or equal to 1 positive integer.
4. device according to claim 3, it is characterized in that, described 1 cuts (N-1)/2 of cutting (N-1)/2+1 two groups of switches with 1 in (N-1)/2 is connected by holding wire with N number of port in described filter respectively with (N-1)/2+1 switching over interface.
5. device according to claim 3, is characterized in that, described network analyzer comprises two interfaces, and two interfaces of described network analyzer are connected with two groups of switches of described switch control module respectively.
6. the method for testing of a kind of isolation degree test device according to any one of claim 1-5, is characterized in that, comprising:
Terminal sends the switching over signal of interport isolation to be measured to switch control module;
Switch in this switch control module switches by the switching over signal that described switch control module sends according to described terminal, communicates with port to be measured to make described switch control module;
Described terminal sends the test signal of interport isolation to be measured to described switch control module by described network analyzer;
Described switch control module obtains the isolation signal of described port to be measured according to described test signal, and described isolation signal is sent to described terminal by described network analyzer.
7. method according to claim 6, is characterized in that, described method also comprises:
Described terminal, when receiving the isolation of port to be measured, judges described isolation whether in the scope of default isolation, and under the isolation of test result and corresponding port is stored in the sequence number catalogue of filter corresponding to this port.
8. method according to claim 7, is characterized in that, described method also comprises:
To send the switching over signal of interport isolation to be measured to switch control module in described terminal before, obtain the sequence number of filter, judge whether the port of the filter that described sequence number is corresponding carried out isolation degree test according to described sequence number catalogue;
Without test result under described sequence number catalogue, or have not by test test result time, the step of the isolation of described execution test port.
9. method according to claim 8, is characterized in that, described method also comprises:
Without test result under described sequence number catalogue, or have not by test test result time, obtain preset calibration file;
Calibrate according to the port path of default calibration file to the filter of isolation to be tested;
Accordingly, the generation method of described default calibration file comprises:
Every bar port path of the filter of isolation to be tested is numbered, and mates corresponding switching over pattern to every bar port path;
Successively every bar port path is calibrated, generate and preserve this calibration file.
10. method according to claim 6, is characterized in that, described method also comprises:
When the isolation of the port of test filter, test according to the default frequency corresponding with described filter bandwidht.
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| CN105929279B (en) * | 2016-05-16 | 2018-08-24 | 中国电子科技集团公司第四十一研究所 | Index testing device and method are isolated between a kind of Multi-channel microwave receiving unit road |
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| CN106556755B (en) * | 2016-10-17 | 2019-05-03 | 华讯方舟科技（湖北）有限公司 | A kind of microwave converter input isolation test and system |
| CN106771554A (en) * | 2016-12-13 | 2017-05-31 | 深圳市威通科技有限公司 | Multiport microwave device test system and method |
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| CN107070696B (en) * | 2017-02-13 | 2018-06-22 | 国网山东省电力公司淄博供电公司 | A kind of cable network performance analytical equipment and analysis method |
| CN108170025A (en) * | 2017-12-26 | 2018-06-15 | 陕西航天时代导航设备有限公司 | A kind of implementation for improving compliant platform servo mechanism isolation |
| CN110031747A (en) * | 2019-04-25 | 2019-07-19 | 北京中科飞鸿科技有限公司 | A kind of intelligent method for testing multi-channel filter assembly property parameter |
| CN112816787A (en) * | 2020-12-29 | 2021-05-18 | 广东湾区智能终端工业设计研究院有限公司 | Line loss point inspection system and method |
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